empty_string_publisher.py

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#!/usr/bin/env python
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__author__ = 'Kentaro Wada <www.kentaro.wada@gmail.com>'

import rospy
from std_msgs.msg import String


class EmptyStringPublisher(object):

    def __init__(self):
        self.pub = rospy.Publisher('~output', String, queue_size=1)
        self.timer_pub = rospy.Timer(
            rospy.Duration(0.1), self.publish_callback)

    def publish_callback(self, event):
        self.pub.publish(String())


if __name__ == '__main__':
    rospy.init_node('empty_string_publisher')
    EmptyStringPublisher()
    rospy.spin()